Worksheet: Converting Concentrations to pH and pOH

In this worksheet, we will practice converting between hydronium and hydroxide ion concentrations in water and the corresponding values of pH and pOH.

Q1:

At ,
the hydronium ion concentration of vinegar is approximately M. To 1 decimal place, what is the corresponding value of the pOH?

Q2:

To 1 decimal place, what is the pH of a 0.0125 M
solution of potassium hydroxide, ?

Q3:

What is the pOH of a 0.0125 M
solution of potassium hydroxide,
?

A12.1

B4.01

C1.90

D0.0125

E9.99

Q4:

To 1 decimal place, what is the pH of 0.21 M at ? Assume that ionizes completely.

Q5:

To 2 decimal places, what is the pH of 0.000071 M at ? Assume that ionizes completely.

Q6:

To 2 decimal places, what is the pOH of 0.21 M at ? Assume that ionizes completely.

Q7:

To 2 decimal places, what is the pOH of 2.5 M at ? Assume that ionizes completely.

Q8:

To 1 decimal place, what is the pH of 2.5 M at ? Assume that ionizes completely.

Q9:

To 2 decimal places, what is the pOH of 0.000071 M at
? Assume that ionizes completely.

Q10:

Calculate to 3 significant figures the hydroxide concentration of a solution with a pH of 6.52 at . The self-ionization constant of water, , is at this temperature.

A
M

B
M

C
M

D
M

E
M

Q11:

Coffee has a pH of about 5.1. Calculate to 2 significant figures the hydroxide ion concentration of coffee at .

A
M

B
M

C
M

D
M

E
M

Q12:

To 2 decimal places, what is the pH of 0.0143 M at ? Assume that ionizes completely.

Q13:

To 1 decimal place, what is the pOH of 3.0 M at ? Assume that ionizes completely.

Q14:

To 2 decimal places, what is the pOH of 0.0143 M at ? Assume that ionizes completely.

Q15:

To 1 decimal place, what is the pOH of 0.0031 M
at ?
Assume that ionizes completely.

Q16:

To 1 decimal place, what is the pH of 0.0031 M at ? Assume that ionizes completely.

Q17:

The pOH of a solution of a base is 4.17, at . What is the concentration?

A
M

B
M

C
M

D
M

Q18:

To 1 decimal place, what is the pOH of a 0.000259 M aqueous solution at ? Assume that is completely ionized.

Q19:

To 1 decimal place, what is the pOH of 0.200 M
at ? Assume that ionizes completely.

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